macOS Mojave requires a graphics card that supports Metal, an Apple technology that lets the system and apps efficiently tap into the capabilities of today’s graphics processors (GPUs). The graphics cards offered by Apple in Mac Pro (Mid 2010) and Mac Pro (Mid 2012) don't have GPUs that support Metal, so these systems require upgraded graphics cards in order to install macOS Mojave.

Before you upgrade to macOS Mojave on these Mac Pro models, you need to update to macOS High Sierra 10.13.6 and then make sure that your graphics card is compatible. You also need to turn off FileVault.

In the sidebar, select Graphics/Displays. If your graphics card is compatible, you see "Supported" next to the Metal entry. You can also note the name of your graphics card and see if it's in the list below.

Some other third-party graphics cards* based on the following AMD GPU families might also be compatible with macOS Mojave on Mac Pro (Mid 2010) and Mac Pro (Mid 2012):

AMD Radeon RX 560

AMD Radeon RX 570

AMD Radeon RX 580

AMD Radeon Pro WX 7100

AMD Radeon RX Vega 56

AMD Radeon RX Vega 64

AMD Radeon Pro WX 9100

AMD Radeon Frontier Edition

If the graphics card in your Mac Pro isn't listed above, you need to install one that's compatible with macOS Mojave. If you need additional help, contact Apple Support.

* Third-party graphics cards vary, so you should check with the vendor of your specific graphics card for compatibility details.

Turn off File Vault, then install macOS Mojave

Many third-party graphics cards won't show anything on the display when macOS Mojave is starting up, including the Apple logo and startup progress bar. As a result, you can't log in to a system that uses FileVault, choose a different startup disk before your Mac boots into macOS, or perform some hardware diagnostics.